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TABLE 25-1

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Downstream signals containing modulated carriers with digitally encoded manufacturing instructions make up the forward signal. Messages are sent from the headend to the manufacturing machines and offices. Upstream signals on modulated RF carriers contain data, requests for materials, and schedule progress. These are sent through the headend to other offices and warehouses.

10. Did Les use the right words Are the words familiar to you, unless they re unique or were selected to add richness

A glass-based fiber-optic cable has a glass core and glass cladding, with impurities added to obtain the desired indices of refraction necessary to guide light rays through the fiber. This type of cable has the lowest value of attenuation; however it is also the most expensive of the three , types of materials used to create an optical fiber. Concerning utilization, a glass-based fiber-optic cable is by far the most commonly used type of optical cable. Thus, it also represents the type of cable that installers are most familiar working with, which means that functions such as cable splicing and pulling techniques are well known. Because of its low attenuation, a glass fiber is always used for singlemode optical cable. Because single-mode fiber requires a very thin case, its composition eliminates the potential use of plastic, which requires a thicker core. Another characteristic of glass fiber is its capability to support a relatively high signaling rate. Some types of single-mode step-index optical fiber can support a gigahertz signaling rate.

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TABLE B.4 K Cv Ca 0.0000 -0.1929 -0.3856 -0.5778 -0.7693 -0.9599 91 92 93 94 95 0.89182 0.90048 0.90880 0.91676 0.92436 0.93161 0.93849 0.94500 0.95114 0.95690 96 97 98 99 100 -1.1493 -1.3373 -1.5237 -1.7082 -1.8907 90 0.88282 1.0997 1.0594 1.0184 0.9767 0.9343 0.8912 0.8477 0.8036 0.7592 0.7143 0.6691 1.7596 1.7588 1.7564 1.7523 1.7467 1.7395 1.7307 1.7204 1.7084 1.6950 1.6800 0.11718 0.12650 0.13616 0.14613 0.15642 0.16701 0.17788 0.18905 0.20049 0.21220 0.22417 1.3229 1.3566 1.3892 1.4206 1.4508 4.1081 3.9765 3.8401 3.6989 3.5553 66 67 68 69 70 0.58750 0.60178 0.61617 0.63035 0.64442 1.1392 1.1778 1.2156 1.2524 1.2882 4.6380 4.5829 4.4722 4.3561 4.2347 61 62 63 64 65 0.51466 0.52931 0.54393 0.55851 0.57304 1.0997 4.7874 60 0.50000 Cv Ca Pt. K Cv K Pt. Ca

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ciscoasa> clear enable exit help login logout ping quit show traceroute ciscoasa> Reset functions Turn on privileged commands Exit from the EXEC Interactive help for commands Log in as a particular user Exit from the EXEC Send echo messages Exit from the EXEC Show running system information Trace route to destination

Windowing Windowing is a much more sophisticated method of flow control than using ready/not ready signals. With windowing, a window size is defined that specifies how much data (commonly called segments at the transport layer) can be sent before the source has to wait for an acknowledgment (ACK) from the destination. Once the ACK is received, the source can send the next batch of data (up to the maximum defined in the window size). Windowing accomplishes two things: First, flow control is enforced, based on the window size. In many protocol implementations, the window size is dynamically negotiated up front and can be renegotiated during the lifetime of the connection. This ensures that the most optimal window size is used to send data without having the destination drop anything. Second, through the windowing process, the destination tells the source what was received. This indicates to the source whether any data was lost along the way to the destination and allows the source to resend any missing information. This provides reliability for a connection as well as better efficiency than ready/not ready signals. Because of these advantages, most connection-oriented transport protocols, such as TCP/IP s TCP, use windowing to implement flow control. The window size chosen for a connection impacts its efficiency and throughput in defining how many segments (or bytes) can be sent before the source has to wait for an ACK. Figure 2-2 illustrates the importance of the size used for the window. The top part of the figure shows the connection using a window size of 1. In this instance, the source sends one segment with a sequence number (in this case 1) and then waits for an acknowledgment from the destination. Depending on the transport protocol, the destination can send the ACK in different ways: it can send back a list of the sequence numbers of the segments it received, or it can send back the sequence number of the next segment it expects. The ACK from the destination has a number 2 in it. This tells the source that it can go ahead and send segment 2. Again, when the destination receives this segment, since the window size is 1, the destination will immediately reply with an acknowledgment, indicating the receipt of this segment. In this example, the destination acknowledges back 3, indicating that segment 3 can be sent, and so on and so forth.